Friction Signal Touch Sensing for Interference-Resistant Control

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Solution Overview

Problem

Existing touch technologies for acoustic devices, such as capacitive, pressure-sensitive, and optical, face issues like light interference, sweat sensitivity, and susceptibility to damage, making them unreliable for precise touch control.

Innovation Solution

A device utilizing friction signals generated by user sliding on distinct sliding regions with different material and structural features to identify touch operations, enhancing distinguishability through acoustic signal analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If optical touch technology is used, then touch control function is achieved, but light interference and distortion on curved surfaces occur

Engineering Contradiction:

Improvetouch control functionVSAvoidresistance to light interference

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent replaces optical touch technology with acoustic wave-based friction signal detection. Instead of using light to detect touch operations, the system uses acoustic waves to capture friction signals generated when a user slides on the device surface, thereby eliminating light interference issues while maintaining touch control functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces friction signals as an intermediary between the user's touch action and the device's response. The friction signal acts as a mediator that carries information about the sliding operation, enabling touch control without direct optical or capacitive sensing that is susceptible to environmental interference

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If capacitive touch technology is used, then touch control function is achieved, but susceptibility to sweat and distortion problems occur

Engineering Contradiction:

Improvetouch control functionVSAvoidsensitivity to sweat

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent replaces capacitive sensing with acoustic wave-based friction signal detection. Instead of measuring electrical capacitance changes that are affected by sweat and moisture, the system uses acoustic waves to detect mechanical friction signals, eliminating sensitivity to substances like sweat while preserving touch control capability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If resistive touch technology is used, then touch control function is achieved, but susceptibility to scratching and damage occurs

Engineering Contradiction:

Improvetouch control functionVSAvoidresistance to scratching and damage

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The patent replaces resistive touch technology with acoustic wave-based friction signal detection. Instead of using physical pressure layers that are prone to scratching and damage, the system uses acoustic waves to detect friction signals from the surface, eliminating mechanical wear and damage while maintaining touch control functionality

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Measurement precision

If sliding regions with different features are implemented, then distinguishability of friction signals is improved, but device complexity increases

Engineering Contradiction:

Improvedistinguishability of friction signalVSAvoidsurface structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating sliding regions with different surface features (such as different roughness levels, materials, or structures) in specific locations on the device surface. Each region's unique characteristics generate distinct friction signal patterns, enabling the system to distinguish between different sliding operations without requiring complex overall device architecture

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables reliable and precise touch control by distinguishing sliding directions and forces based on varying friction signal characteristics, reducing algorithm complexity and improving user interaction accuracy.

Implementation Method 1

an acoustic wave-based technical solution is now proposed, which can identify a friction signal generated when a user slides on the surface of a device

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250370572A1Methods and devices for identifying a touch operation using friction signals

Publication Date: 2025.12.04 SHENZHEN SHOKZ CO LTD

AI summary

A device for using a friction signal to identify a touch operation. At least part of the surface of the device comprises a sliding regions, the sliding regions include a first sliding region and a second sliding region, the first sliding region and the second sliding region have different features, and the features are manifested in distinguishability of a friction signal generated by a finger sliding in the first sliding region and a friction signal generated by a finger sliding in the second sliding region in a time domain or a frequency domain.